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国内采用的机械自动送料冲孔模具一般为各种类形的滚轴式自动送料结构。滚轴式自动送料结构适用于冲压孔距较大,板料宽度较窄的工件。在生产中常出现:板料剪切时留有毛刺;板料表面变形或粘有异物;冲压后出现毛刺等情况。这时,滚轴与板料只是两点接触,会导致送料步距不一样,孔距大小不一,严重的会出现孔重叠现象。滚轴式送料,板料不能留出前后边缘。网板孔的排列是交错的,冲压后,前、后边缘不完整,达不到图纸要求。滚轴式自动送料模具,体积较大,占用空间大,噪音较大,结构较复杂。图1所示零件网板,宽度大,孔距小,共有孔1400多个。
Domestic use of mechanical automatic feed punching die is generally various types of roller-type automatic feeding structure. Roller-type automatic feed structure for stamping hole spacing, sheet metal width narrow workpiece. Often appear in the production: leaving a glitch when the sheet is cut; sheet surface deformation or sticky foreign matter; Burr after stamping and so on. At this time, the roller and the sheet material are only two points of contact, which will result in different feeding steps, different hole pitches and serious hole overlap. Roller feed, the sheet can not be set out before and after the edge. Mesh hole arrangement is staggered, after stamping, before and after the edge is not complete, can not meet the requirements of the drawings. Roller-type automatic feeding mold, large size, large space, noisy, complex structure. Parts shown in Figure 1 mesh plate, wide, small pitch, a total of more than 1,400 holes.